Asymmetric Synthesis of Aziridine 2-Phosphonates from Enantiopure Sulfinimines (<i>N</i>-Sulfinyl Imines). Synthesis of α-Amino Phosphonates
作者:Franklin A. Davis、Yongzhong Wu、Hongxing Yan、William McCoull、Kavirayani R. Prasad
DOI:10.1021/jo020707z
日期:2003.3.1
chloromethylphosphonate anions to enantiopure sulfinimines, has been developed for the asymmetric synthesis of aziridine 2-phosphonates. Best results involve cyclization of the syn and anti diastereomerically pure alpha-chloro-beta-amino phosphonates to cis- and trans-N-sulfinyl aziridine 2-phosphonates, respectively, with n-BuLi. A transition-state hypothesis is proposed wherein the chloromethylphosphonate
已经开发出一种氮杂-Darzens反应,该反应涉及将氯甲基膦酸根阴离子加到对映体纯的亚磺酸亚胺中,用于不对称合成氮丙啶2-膦酸酯。最好的结果涉及用正丁基锂将顺式和反非对映体纯的α-氯-β-氨基膦酸酯分别环化为顺式和反式-N-亚磺酰基氮丙啶2-膦酸酯。提出了一种过渡态假说,其中氯甲基膦酸根阴离子在与庞大的对甲苯基亚磺酰基相反的一侧上的CN键上加成。通过用MeMgBr或TFA / MeOH处理可轻松除去N-亚磺酰基,从而以高收率获得NH-氮丙啶。使用转移氢化条件,